Research: My research program is focused on making knowledge advancements in agriculture that result in higher crop profitability, reduced environmental impact, and resource security. Crops are studied at the systems level to understand how they interact with environmental and management factors over the course of time. The physiology of crop plants is explored at the whole-plant level to better understand their functional traits in the context of stress and under varied management. Biological nitrogen fixation, crop stress responses, root system biology, and cropping system diversity are topics of interest. Focus crops include food, fiber, and other bio-based product crops.